Electric dust precipitator



June 5, 1956 J. J. osMAR 2,748,887

ELECTRIC DUST PRECIPITATOR Filed Aug. 4, 1952 /0 /5 5 7 7 2' J A j ATTORNEYS ELECTRICDUST PRECIPITATOR JohnJ'. Osmar, West. PalmBeach, Fla.

Application. August 4,. 1952, Serial No. 302,536

6.Clams.4 (Cl. 183.-7)

Thisinvention relates to adust collector.

An object ofthisl invention is to provide a dust collector which embodies means for settingfup electric discharge impulses whichwill efectthe deposit' of dust particles on a collector.

Another'object ofthis invention is to provide a dust collector' embodying-a tubular duct with a suction fan at one end offthef duct and. a pair of electrodes within the duct which produce an electrical flux whereby dust particles in the air circulating through the tube will be deposited onto` a collector sheet which ispositioned across the tube.

A furtherv object of'thisL invention is to produce an electric circuit of relatively'high Voltage-with a pair of confronting electrodes which are spaced apart a distance such as to. eliminate any sparks being produced and at the same timel develop an electrical uX whereby dust particles will becaused to bombard one of the electrodes or acollector disposed infront of said one electrode.

A further object of this invention is to provide a'n electrical` dust collecting-means embodying-a pair of spaced electrodes wherein-one electrode is vvery small in size and the -otherelectrode is substantiallylarge in sizeso that a conical electrica-lilux will be formed, and any dust par-- ticles-adjacent the electrodes will befsucked into the electrical field` or flux andl willY lne-bombarded onto a collector where-the-partic1es will be retained.

With the-above and other objects in view, my invention consists'in the arrangement, combination and detailsl of construction disclosed in the drawing and specification, and then more particularly'pointed out in the appended claims.

In--the drawing:

Figure 1 is a horizontal section of-a dust collecting machineconstructed according toan embodiment of this invention showing diagrammatically the electric circuits embodied in this invention.

Figure Z'is adiagrammatic view showing the main electric circuit embodied'in this invention.

Figure 31 is.;a sectional view taken on vthe line 3-3 of Figure l;

Referringtorthe drawing, the numeral 10 designates generallyl a hou-sing which is formed of front and rear wallsallandll, respectively, opposite side walls 13 and 14, with the latter formed as a closure. Side wall 14 includes inwardly projecting front and rear walls 15 and 16,. which; form achamberedclosurewhich is hingedly securedy as at 17, toiherear .wall 12.,

Aafeleasahlefcatch-or.fasteningmeansffl is adapted .to secure the closure 14 in closed position. It will, of course, be understood that the housing 10 embodies top and bottom walls (not shown) so as to form a completely enclosed housing. A horizontally disposed tube 19 extends through and between the front and rear walls 11 and 12, and a anged bushing 20 is interposed between the front wall 11 and the forward or intake end of the tube 19. A similar flanged bushing 21 is interposed between the rear end of the tube 19 and the rear wall 12.

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A pair of electrodes 22 and 23 are disposed substantially centrally of the length of the tube 19 and in the axial center thereof with electrodes 22 and 23 spaced apart a suicient distance so that when these electrodes are connected with a source of electric energy, there will not be any spark or sparks jumping between the electrodes.

A partition wall 24- is secured between the front and rear Walls 11. and 12-and divides a portion of the housing 1t) into a transformer chamber 25. A transformer 26 of: the step-uptype is disposed in the chamber 25.and includes a secondary 27, which is connected by conductors 28l and 29 to terminals 30 and 31, respectively. The terminals Siand 31 are disposed at the end of the housing 10 adjacent the closure 14, and a conductor 32-connects terminal 30 with electrode 22; whereas a conductor 33fconnects terminal 31v with electrode 23.

The transformer 26 also includes a primary 34 which is connected' by means of' a conductor 35 to a. terminal 36 of a connector socket 37. A fuse 38 is interposedv in conductor 3l5and` conductor 35U includes an extension 39 whi'chis.connectedV toone side of a light 40 disposed withinfthe housing 1:5). The terminal socket or connector 37 includes a secondterminal 41 with which one end of a conductor 4Z; is connected and conductor 42 is connected to a switch 437.

` Thev switch43 is a main switch and a conductor 44 is connectedy to a normally closed spring-pressed switch 46. The switch 46 includes a spring-pressed button 47, which isadapted to be engaged'by an angle member 48 carried by the flange 15 so that switch 46 will be disposed in closed position. when closure 14 is in opened position. The other side of `switch 46 is connectedv by means of a conductor 49to a conductor 50, which is connected with theV otherV end of the primary 34. An auxiliary switch 51" is connected at oneside thereof by means of a conductorf 52 toterminal or contact 45 of switch 43, and switch 51 includesza contact 53 which is connected by means of'a conductor 54 to a terminal 55 of a connector socket 56.

Connector socket 56 includes a second terminal 5? `which is connected by means of a conductor 58 to condutorrfS. A pilotlight S9`i's connected across. conductors 351and 49- by means'of conductors 6 0 and 6.1. A suctionfan 62j is mountedV at the discharge end of tube 19, being secured? on an annular iiange 6.3 by fastening members 64.'A Flange 63 is carried by the bushing 2,1.

The fanI 62 includes an apertured sleeve 6,5 having a plurality of apertures 66; through which air is adaptedV to be discharged' by means. of a suction fan blade 67. The fan62' isconnected with connector socket 56 by means.:

of 'aV double wire conduit 68. Preferably, the electrode 23 isof: frustoconical configuration with the base or large endthereofl confronti-ng the electrodev 22, and electrode 23 is slidable on afhorizontally disposed guide 69' and is constantly urged forwardly by means of a spring 70a.

Theforward or inner end of the electrode 23 may have a-capo-rplate 71 monntedthereon which is adapted' to. v be'disposed in contacting relation with a sheet or plate 72, which is insertedY transversely across theY tube 19 through slots` 73and- 74, which areA formed in the-tubel 19 Thesheet 72 may bepaper, thin cardboard or the like. One face off-l thesheet or collector 72 is adapted toconfronu thesmallI electrode 22 and,l as shownrin Fige ures 1 and 2, the energizing of the transformer 26 will produce a conical electrical eld or ilux, indicated at 75, which extends from electrode 22 to the collector sheet 72. This eletrical field will cause a bombardment of the collector 72 by the dust particles which are drawn into the tube 19 by the suction caused partly by the suction fan blade 67 and partly by the suction force created by the electrical field 75.

The core 76 of transformer 26 is adapted to be connected with a ground connector socket 77 by means of a conductor 78.

in the use and operation of this device, the connector 37 is connected to a source of electric current supply and after sheet or collector 72 is extended across the tube 19 and closure 14 has been opened, switches 43 and 51 may be closed. Switch 43 will energize transformer 26 and switch 51 will effect operation of suction fan 62. Suction fan 62 will cause a draft of air to move through tube 19 from the left to the right, as viewed in Figure 1, and inasmuch as the energizing of the electrodes 22 and 23 will produce the electrical ield 75, any dust particles in the air stream moving through tube 19 will be bombarded onto the collector 72 for adherence to the latter.

This dust collector is particularly desirable for use in the operating rooms of hospitals or in other enclosures where it is desired to have the air as free from dust as is possible.

l do not mean to confine myself to the exact details of construction herein disclosed, but claim all variations falling within the purview of the appended claims.

What is claimed is:

1. A dust collector or precipitator comprising a tubular duct having a pair of opposed open ends, a pair of axially aligned electrodes disposed in said duct in spaced apart relation, means connecting said electrodes in an electric circuit, a sheet extending transversely across said duct between said electrodes, the width of said sheet being less than the inner diameter of said duct, guide means disposed in said duct for one of said electrodes, said one electrode being mounted for reciprocation on said guide means, and resilient means carried by said guide means and engaging said one electrode to constantly bias said one electrode for movement in abutting relation with respect to said sheet.

2. A dust collectoror precipitator comprising a tubular duct having a pair of opposed open ends, a pair of axially aligned electrodes disposed in said duct in spaced apart relation, a sheet extending transversely across said duct between said electrodes, the width of said sheet being less than the inner diameter of said duct, one of said electrodes being impcrforate and of frusto-conical configuration with the large end thereof confronting the other of said electrodes, said other of said electrodes having its said confronting end of smaller area than the area of said large end of said one electrode, means connecting said electrodes in an electric circuit, guide means disposed in said duct for said one of said electrodes, said one electrode being mounted for reciprocation on said guide means, and resilient means carried by said guide means and engaging said one electrode to constantly bias said one electrode for movement in abutting relation with respect to said sheet.

3. A dust collector or precipitator comprising a tubular duct open at each end, a pair of axially aligned electrodes disposed in said duct in spaced apart relation, one of said electrodes being imperforate and of frusto-conical configuration with the large end confronting the other of said electrodes, said other of Said electrodes having its said confronting end of smaller area than said large end of said one electrode, said electrodes each having dimensions smaller than the diameter of said duct, means connecting said electrodes in an electric circuit, said duct having transversely aligned slots, a collector sheet extending through said slots, guide means disposed in said duct for said one electrode, said one electrode being mounted for reciprocation on said guide means, and resilient means carried by said guide means and engaging said one electrode to constantly bias said one electrode for movement in abutting relation toward said sheet.

4. A dust collector or precipitator comprising a tubular duct open at each end, a pair of axially aligned electrodes disposed in said duct in spaced apart relation, one of said electrodes being imperforate and of frusto-conical configuration with the large end thereof confronting the other of said electrodes, said other of said electrodes having its said confronting end of smaller area than said large end of said one electrode, said electrodes each having dimensions smaller than the diameter of said duct, means connecting said electrodes in an electric circuit, said duct having transversely aligned slots, a collector sheet extending through said slots, guide means disposed in said duct for said one of said electrodes, said one electrode being mounted for reciprocation on said guide means, resilient means carried by said guide means and engaging said one electrode to constantly bias said one electrode for movement thereof to bring said large end of said one electrode into abutting relation with respect to said sheet, and a suction fan at one end of said duct.

5. A dust collector or precipitator comprising a tubular duct open at each end, a pair of axially aligned electrodes disposed in said duct in spaced apart relation, one of said electrodes being imperforate and of frusto-conical conguration with the large end facing the other of said electrodes, a guide member supported on said duct and extending therein, means slidably mounting said one electrode on said guide member, said electrodes each having dimensions smaller than the diameter of said duct, means connecting said electrodes in an electric circuit, said duct having transversely aligned slots, a collector sheet extending through said slots in Contact with said frustoconical electrode, and means on said guide member biasing said one electrode for movement toward said collector sheet.

6. A dust collector or precipitator comprising a tubular duct open at each of its respective ends, a pair of axially aligned electrodes disposed in said duct in spaced apart relation, one of said electrodes being imperforate and of frusto-conical coniiguration with the large end thereof confronting the other of said electrodes, a guide member supported on said duct and extending therein, means slidably mounting said one electrode on said guide member, said electrodes each having dimensions smaller than the diameter of said duct, means connecting said electrodes in an electric circuit, said duct having transversely aligned slots, a collector sheet extending through said slots in contact with said truste-conical electrode, means on said guide member biasing said one electrode for movement toward said collector sheet, and a suction fan at one end of said duct.

References Cited in the le of this patent UNITED STATES PATENTS 1,822,074 Winchester Sept. 8, 1931 1,980,521 Hahn Nov.13, 1934 2,142,129 Hoss et al. Jan. 3, 1939 2,488,712 Dahlman Nov. 22, 1949 2,594,805 Rommel Apr. 29, 1952 FOREIGN PATENTS 41,136 Norway Mar. 30, 1925 133,465 Austria May 26, 1933 469,785 France May 29, 1914 

